... the electrocircuitIt can be used with computer, mobilephone,mp3,mp4 and various players Products accessories:1 pcs ... doesn't in use status Function:Perfect stone Disk U , TF card,mobilephone card, mp3,mp4,wma docs playerAux ... Mode can be receive CD,DVD,MP3,MP4,MP5, computer stereo connectedWith FM radio ( ... ,4 0h msBatteryLi-ion 3.7v,600MAH1.Play Mp3 format music from USB TF.2.Press mode ...